At the corner of Broadway and 11th Street, the Cast Iron Building stands as a remarkable survivor of a pivotal era in New York City’s architectural and commercial history. Designed by John Kellum and completed in 1868, the seven-story building was originally home to a prominent dry goods retailer in the Ladies’ Mile shopping district. Its ornate cast-iron façade reflected the innovation of the era, offering strength, durability, fire resistance, and intricate architectural de

This article was originally published as follows and is republished here under the Creative Commons Attribution (CC BY) license: Michiels, T., Gasha, A., Sibille, L. and Olivieri, C., 2026. Guastavino spiraling staircases: Construction history, documentation, and structural analysis through the case of St. John the Divine. International Journal of Engineering Science, 228, p.104641. A B S T R A C T This paper presents the first comprehensive study of Guastavino spiraling stai

New York City Department of Buildings (NYCDOB) LL126, Article 323, requires building owners to complete a series of steps to help improve the safety of parking garage structures in all five boroughs. A parking structure is defined as a building or space used for parking or storage of motor vehicles, other than an automotive service station, automotive repair shop, or private garages serving one- and two-family homes not exceeding 650 square feet in area and one-story height.

The Marriage of Earth and Water and Fire Boston Valley Terra Cotta explores the past, present and future potential of a highly versatile, sustainable, durable and beautiful material. Terra cotta, Italian for ‘baked earth,’ deriving from the Latin Terra Cocta, is a natural clay-based material dating back to ancient civilizations. On the morning of March 5, 2026, a three-person team from Boston Valley Terra Cotta, a global manufacturer of custom architectural façade solutions f

The Barclay Vessey Building, 140 West Street Arcade The Queensboro Bridge Western Underside Vault Space Restoration Retrospective Location: Andromeda Auditorium On November 12, Skyline Restoration hosted two distinguished professionals who brought presentations of their own experiences working with Guastavino Vaults to a diverse group of restoration industry professionals. Each presenter told the attendees about their specific learning curve with the “Cohesive Construction” G

On October 1st, Skyline Restoration proudly hosted the 2nd Annual Demo Day: Plaza Waterproofing Edition , presented in collaboration with the ICRI Metro New York Chapter and the National Women in Roofing - NYC Council (NWIR). From live demos to expert-led presentations, attendees got an up-close look at plaza waterproofing systems, inverted roof assemblies, and expansion joint transitions—a hands-on experience that brought technical insight to life. A big thank-you to all

A behind-the-scenes look at how engineers safely restored the viaduct ceiling under Park Avenue’s historic Helmsley Building. The Park Avenue Viaduct, one of Midtown Manhattan’s busiest roadways, runs through the base of the 35-story Helmsley Building. Since the ceilings of the two arched tunnels are part of the 35-story Beaux-Arts building’s exterior wall system, they are subject to compliance with New York City’s Façade Inspection and Safety Program regulations. - PHOTO: AL

Updated guidebook, enhanced landmark maps, and new archaeology database improve access to preservation resources. Image: NYC.GOV On June 27, the NYC Landmarks Preservation Commission (LPC) announced the launch of new and updated resources to help the public more easily access agency information and navigate the permitting process. The updated LPC Permit Guidebook: How to Get Staff-Level Approvals provides step-by-step guidance for submitting complete, accurate applications,